Generator Test (Overcharged Battery Check) - Suzuki GRAND VITARA Owner's Manual

No-Load Check
1) Run engine from idling up to 2000 rpm and read
meters.
NOTE
Turn off switches of all accessories (wiper,
heater etc.).
Specification for undercharged battery (No-load
check)
Current: 10 A
Voltage: 14.2 – 14.8 V (at 20 °C, 68 °F)
NOTE
Consideration should be taken that voltage
will differ somewhat with regulator case
temperature as shown in figure.
(V)
16.0
15.5
15.2
15.0
14.5
[A]
14.3
14.0
13.5
13.0
-30 0
22
[A]: Regulated voltage (V)
[B]: Heat sink temperature (°C)
2) Using service wire, ground "C" terminal (1) of
generator.
3) Measure voltage between "B" terminal of generator
and body ground.
Voltage: 12.5 – 13.1 V (at 20 °C, 68 °F)
• If voltage is higher than standard value
If voltage is higher than standard value, check ground
of brushes.
If brushes are not grounded, replace IC regulator.
If voltage is lower than standard value, proceed to the
following check.
14.6
14.8
14.2
13.3
20 120 (˚C)
68 248 (˚F)
[B]
I5JB0A1A0006-02
I5JB0A1A0011-01
Load Check
1) Run engine at 2000 rpm and turn on head light and
heater motor.
2) Measure current and if it is less than 30 A repair or
replace generator.

Generator Test (Overcharged Battery Check)

1) To determine battery condition, refer to "Battery
Description: ".
2) If obvious overcharge condition exists as evidenced
by excessive spewing of electrolyte, measure
generator "B" terminal voltage at engine 2000 rpm.
(V)
16.0
15.5
15.2
15.0
14.5
[A]
14.3
14.0
13.5
13.0
-30 0
22
[A]: Regulated voltage (V)
[B]: Heat sink temperature (°C)
3) If measured voltage is higher than upper limit value,
proceed to disassemble generator.
4) Check ground of brushes. If brushes are not
grounded, replace IC regulator. Then check field coil
for grounds and shorts, referring to "Generator
Inspection: ".
Charging System:
S5JB0A1A04003
14.6
14.8
14.2
13.3
20 120 (˚C)
68 248 (˚F)
[B]
I5JB0A1A0006-02
1J-5